2021-6-8 前端达人
本问下面有矢量图层设置的区域,和热力图层设置的热力图的效果,区域绘制效怎么设置详细内容可以访问 openlayers6【十七】vue VectorLayer矢量图层画地图省市区,多省市区(粤港澳大湾区)效果详解,主要讲解的是热力图层效果实现。区域绘制只是为了效果更好看。好了,继续往下看
在 openlayers 中,图层是使用 layer 对象表示的,主要有 WebGLPoints Layer
、热度图(HeatMap Layer)
、图片图层(Image Layer)
、切片图层(Tile Layer)
和 矢量图层(Vector Layer)
五种类型,它们都是继承 Layer 类的。
前面两篇文章 我们讲了矢量图层 VectorLayer
的常用的场景,这篇我们写一篇 HeatMapLayer
的使用。可以看下图所示的热力图实现效果。 放大缩小地图热力图效果。
var heatmapLayer = new ol.layer.Heatmap({ source: source,//热力图资源 opacity:1,//透明度,默认1 visible:true,//是否显示,默认trur zIndex:1,//图层渲染的Z索引,默认按图层加载顺序叠加 gradient:['#00f','#0ff','#0f0','#ff0','#f00'],//热图的颜色渐变 blur: 15,//模糊大小(像素为单位) radius: 8,//半径大小默认为8(像素为单位) extent:[100,30,104,40],//渲染范围,可选值,默认渲染全部 });
2.2.1 addHeatMap()方法详解:
HeatmapLayer
map
中
AppendFeatures()
2.2.2 addHeatMap()方法代码:
/**
* 添加热力图
*/ addHeatMap() { let colors = [ "#2200FF", "#16D9CC", "#4DEE12", "#E8D225", "#EF1616" ]; let hatmapData = [ { name: "成都市" }, { name: "成都市" }, { name: "成都市" }, { name: "成都市" }, { name: "绵阳市" }, { name: "广安市" }, { name: "雅安市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "宜宾市" }, { name: "甘孜藏族自治州市" } ]; let codeList = { 成都市: { center: { lng: 104.061902, lat: 30.609503 } }, 广安市: { center: { lng: 106.619126, lat: 30.474142 } }, 绵阳市: { center: { lng: 104.673612, lat: 31.492565 } }, 雅安市: { center: { lng: 103.031653, lat: 30.018895 } }, 自贡市: { center: { lng: 104.797794, lat: 29.368322 } }, 宜宾市: { center: { lng: 104.610964, lat: 28.781347 } }, 甘孜藏族自治州市: { center: { lng: 101.592433, lat: 30.426712 } } }; this.layer = new HeatmapLayer({ source: new VectorSource(), blur: 30, radius: 15, gradient: colors }); this.map.addLayer(this.layer); this.AppendFeatures(hatmapData, colors, codeList, 50); },
2.2.3 AppendFeatures()方法详解:
new Feature
点new Point
信息
2.2.4 AppendFeatures()方法代码:
/**
* 增加要素到热力图
*/ AppendFeatures(hatmapData, colors, points, max) { for (var i in hatmapData) { if (points[hatmapData[i].name]) { var coords = points[hatmapData[i].name]; this.max = max; var f = new Feature({ geometry: new Point( fromLonLat([coords.center.lng, coords.center.lat]) ) }); this.layer.getSource().addFeature(f); } } }
<template> <div id="app"> <div id="Map" ref="map"></div> </div> </template> <script> import "ol/ol.css"; import VectorLayer from "ol/layer/Vector"; import VectorSource from "ol/source/Vector"; import { Tile as TileLayer, Heatmap as HeatmapLayer } from "ol/layer"; import Proj from "ol/proj/Projection"; import XYZ from "ol/source/XYZ"; import { Map, View, Feature, ol } from "ol"; import { Style, Stroke, Fill } from "ol/style"; import { Polygon, Point } from "ol/geom"; import { defaults as defaultControls } from "ol/control"; import { fromLonLat } from "ol/proj"; // 四川的边界数据文件 import areaGeo from "@/geoJson/sichuan.json"; export default { data() { return { map: null }; }, methods: { /**
* 初始化地图
*/ initMap() { this.map = new Map({ target: "Map", controls: defaultControls({ zoom: true }).extend([]), layers: [ new TileLayer({ source: new XYZ({ url: "http://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}" }) }) ], view: new View({ center: fromLonLat([104.065735, 30.659462]), zoom: 6.5, maxZoom: 19, minZoom: 5 }) }); }, /**
* 设置区域
*/ addArea(geo = []) { if (geo.length == 0) { return false; } let features = []; geo.forEach(g => { let lineData = g.features[0]; let routeFeature = ""; if (lineData.geometry.type == "MultiPolygon") { routeFeature = new Feature({ geometry: new MultiPolygon( lineData.geometry.coordinates ).transform("EPSG:4326", "EPSG:3857") }); } else if (lineData.geometry.type == "Polygon") { routeFeature = new Feature({ geometry: new Polygon( lineData.geometry.coordinates ).transform("EPSG:4326", "EPSG:3857") }); } routeFeature.setStyle( new Style({ fill: new Fill({ color: "#4e98f444" }), stroke: new Stroke({ width: 3, color: [71, 137, 227, 1] }) }) ); features.push(routeFeature); }); // 设置图层 let routeLayer = new VectorLayer({ source: new VectorSource({ features: features }) }); // 添加图层 this.map.addLayer(routeLayer); }, /**
* 添加热力图
*/ addHeatMap() { let colors = [ "#2200FF", "#16D9CC", "#4DEE12", "#E8D225", "#EF1616" ]; let hatmapData = [ { name: "成都市" }, { name: "成都市" }, { name: "成都市" }, { name: "成都市" }, { name: "绵阳市" }, { name: "广安市" }, { name: "雅安市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "自贡市" }, { name: "宜宾市" }, { name: "甘孜藏族自治州市" } ]; let codeList = { 成都市: { center: { lng: 104.061902, lat: 30.609503 } }, 广安市: { center: { lng: 106.619126, lat: 30.474142 } }, 绵阳市: { center: { lng: 104.673612, lat: 31.492565 } }, 雅安市: { center: { lng: 103.031653, lat: 30.018895 } }, 自贡市: { center: { lng: 104.797794, lat: 29.368322 } }, 宜宾市: { center: { lng: 104.610964, lat: 28.781347 } }, 甘孜藏族自治州市: { center: { lng: 101.592433, lat: 30.426712 } } }; this.layer = new HeatmapLayer({ source: new VectorSource(), blur: 30, radius: 15, gradient: colors }); this.map.addLayer(this.layer); this.AppendFeatures(hatmapData, colors, codeList, 50); }, /**
* 增加要素至热力图
*/ AppendFeatures(hatmapData, colors, points, max) { for (var i in hatmapData) { if (points[hatmapData[i].name]) { var coords = points[hatmapData[i].name]; this.max = max; var f = new Feature({ geometry: new Point( fromLonLat([coords.center.lng, coords.center.lat]) ) }); this.layer.getSource().addFeature(f); } } } }, mounted() { this.initMap(); //初始化地图 this.addArea(areaGeo); //添加四川省的边界描边和填充 this.addHeatMap(); //添加热力图数据 } }; </script> <style lang="scss" scoped> // 此处非核心内容,已删除 </style>
//添加热力图层 this.map.addLayer(this.layer) //删除热力图层 this.map.removeLayer(this.layer)
//获取-设置,模糊大小 heatmapLayer.getBlur() heatmapLayer.setBlur(15) //获取-设置,渲染范围 heatmapLayer.getExtent() heatmapLayer.setExtent([100,30,104,40]) //获取-设置,热力图渐变色 heatmapLayer.getGradient() heatmapLayer.setGradient(['#00f','#0ff','#0f0','#ff0','#f00']) //获取-设置,最大级别 heatmapLayer.getMaxZoom() heatmapLayer.setMaxZoom(18) //获取-设置,最小级别 heatmapLayer.getMinZoom() heatmapLayer.setMinZoom(2) //获取-设置,透明度 heatmapLayer.getOpacity() heatmapLayer.setOpacity(0.5) //获取-设置,半径 heatmapLayer.getRadius() heatmapLayer.setRadius(5) //获取-设置,热力源 heatmapLayer.getSource() heatmapLayer.setSource(source) //获取-设置,是否可见 heatmapLayer.getVisible() heatmapLayer.setVisible(true) //获取-设置,图层的Z-index heatmapLayer.getZIndex() heatmapLayer.setZIndex(2) //绑定事件-取消事件 type事件类型,listener函数体 heatmapLayer.on(type,listener) heatmapLayer.un(type,listener)
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